/**
 * Copyright (c) 2008, EffCode, www.effcode.com
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this list 
 * of conditions and the following disclaimer. 
 * Redistributions in binary form must reproduce the above copyright notice, this list 
 * of conditions and the following disclaimer in the documentation and/or other materials
 * provided with the distribution. 
 * Neither the name of the EffCode nor the names of its contributors may be used 
 * to endorse or promote products derived from this software without specific prior written 
 * permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.effdom.impl;

import java.io.Serializable;

import org.effdom.Document;
import org.effdom.Element;

/**
 * @author <a href="mailto:mattias@effcode.com">Mattias Jonsson</a>
 */
public class DocumentImpl implements Document, Serializable {

    public static final byte VERSION = 1;

    private static final long serialVersionUID = 1180381832377250613L;

    private Element root;

    private byte version;

    public DocumentImpl() {
        this(VERSION);
    }

    public DocumentImpl(byte version) {
        this.version = version;
    }

    public ElementImpl createElement(Element parent, short id) {
        return new ElementImpl(this, parent, id);
    }

    public Element rootElement() {
        return root;
    }

    public void setRootElement(Element element) {
        root = element;
    }

    public Element rootElement(short id) {
        return rootElement(createElement(null, id));
    }
    
    public Element rootElement(Element element) {
        setRootElement(element);
        return root;
    }

    public int length() {
        int result = 0;
        if (root != null) {
            Counter counter = new Counter();
            ((NodeBase) root).addLength(counter);
            result = counter.getLength();
        }
        return result;
    }

    public byte version() {
        return version;
    }

    public String toString() {
        String result = "Document version=" + version + "\n";
        if (root != null) {
            result += root.toString();
        } else {
            result = "No root element is set. Call doc.setRootElement(root)";
        }
        return result;
    }
}
